The analysis of the density fluctuations in liquid H2S has been performed by applying a recently proposed theoretical method. Computer simulation results for the correlation functions and the corresponding spectra are reported and compared with the theoretical predictions. A discussion of the differences between the results obtained for H2S and H2O, at comparable thermodynamic states, is carried out. The nature of the interaction potential is invoked to explain the different behavior of the two systems, and the strong anisotropy of the H2O potential which mimics the effect of hydrogen bond is suggested to be the origin of the collective behavior of the density fluctuations propagating through the hydrogen atoms.